More on LC Call Numbers
Here's a list of all LC subject classifications
These classifications determine the first two lines of the call number.
My item has two call numbers?
When you find a book or journal in Mirlyn, you may see that different UM libraries list different call numbers for it.
Don't worry. No one made a mistake. Once upon a time, the different UM libraries had good reasons for cataloging differently. Here's an example: Volumes of the journal Applied and Environmental Microbiology can be found in three different libraries, with three different call numbers:
- AAEL QR 1 .A66
- Science QH 301 .A645
- Public Health RA 421 .A76B
Also, for a long time UGL used LC call numbers for literature (P, PN, PR) but the Graduate library used Dewey Decimal (800s)
Parts of the LC Call Number
Most books in the U-M libraries are organized by Library of Congress call number. Call numbers on books and journals appear either on the spine or on the front cover. A line above the call number identifies the U-M library which owns the item.
The Library of Congress classification system uses alphabetical, numerical, and decimal order.
What do the parts of the call number mean?
Here's a sample call number, with explanation for each line:
QE - letter line, describes general subject area; alphabetical order
862 - number line, narrows subject area; numerical order
.D5 - cutter line, usually specifies author or key word(s) from title; alphabetical then decimal order
H644 - 2nd cutter line (if present*) also in alphabetical then decimal order
1977 - year of publication, numerical order
* If there are two cutter lines, the first one usually further narrows the subject area and the second one reflects the author name or title words